EP2596837A1 - Iron golf club - Google Patents

Iron golf club Download PDF

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Publication number
EP2596837A1
EP2596837A1 EP12193478.0A EP12193478A EP2596837A1 EP 2596837 A1 EP2596837 A1 EP 2596837A1 EP 12193478 A EP12193478 A EP 12193478A EP 2596837 A1 EP2596837 A1 EP 2596837A1
Authority
EP
European Patent Office
Prior art keywords
golf club
iron golf
grip
swing
easiness
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP12193478.0A
Other languages
German (de)
English (en)
French (fr)
Inventor
Takeshi Naruo
Kazuya Ishida
Takashi Kimura
Yasuyuki Ohta
Tetsuya Kanayama
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mizuno Corp
Original Assignee
Mizuno Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mizuno Corp filed Critical Mizuno Corp
Publication of EP2596837A1 publication Critical patent/EP2596837A1/en
Withdrawn legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B53/00—Golf clubs
    • A63B53/04—Heads
    • A63B53/047—Heads iron-type
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B53/00—Golf clubs
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B53/00—Golf clubs
    • A63B53/04—Heads
    • A63B53/06—Heads adjustable
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B53/00—Golf clubs
    • A63B53/10—Non-metallic shafts
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B60/00—Details or accessories of golf clubs, bats, rackets or the like
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B2209/00—Characteristics of used materials

Definitions

  • the present invention relates to an iron golf club.
  • controllability is of high importance.
  • the controllability may be influenced by the easiness of swing of the iron golf club. Whether an iron golf club is easy to swing or not tends to be influenced by inertia moment of the iron golf club. Specifically, if an iron golf club becomes longer, the inertia moment becomes larger and, therefore, it become less easy to swing the iron golf club.
  • Japanese Patent Laying-Open No. 2001-286582 proposes a set of iron golf clubs enabling improved controllability by adjusting the inertia moment.
  • inertia moment of which fulcrum is at a position 170 mm from the rear end of a grip toward the front end of the shaft of the iron golf club, is adjusted. Further, between the rear end and the position 170 mm from the rear end of the grip toward the front end of the shaft of the iron golf club, a heavy substance is inserted.
  • the present invention was made in view of the foregoing, and its object is to provide an iron golf club realizing improved easiness of swing.
  • the present invention provides an iron golf club, having a club length L measured in accordance with 60-degrees method of at least 36.5 inches, including: a carbon shaft; a weight attached to the carbon shaft; a grip attached to one end of the carbon shaft; and a head attached to the other end of the carbon shaft.
  • Sum total of mass of the carbon shaft, the weight, the grip and the head is at least 0.3996 kg and at most 0.4197 kg.
  • a value r/L, where r represents a distance from an upper end of the grip to the center of gravity of the iron golf club, is at least 0.765 and at most 0.795.
  • the 60-degrees method is a method of measuring length of a club, specified in the rule of Japan Golf Association. According to the definition of this method, when a club is placed on a horizontal plane and a 60-dgree plane is set against the sole of the club, the length of the club is the distance from the intersecting point of these two planes to an upper end of the grip.
  • the mass of an iron golf club is a sum of mass of carbon shaft, weight, grip and head.
  • a value r/L that is, r representing the distance from the upper end of grip to the center of gravity of iron golf club divided by L representing the length of the club, is referred to as center-of-gravity-ratio.
  • an iron golf club can be improved to be easier to swing, by optimizing the mass and the center-of-gravity-ratio r/L of the iron golf club having a carbon shaft and a weight, with the iron golf club having the length of at least 36.5 inches. Specifically, easiness of swing of the iron golf club can be improved if the iron golf club has the mass of at least 0.3996 kg and at most 0.4197 kg and the value of center-of-gravity-ratio r/L is at least 0.765 and at most 0.795.
  • the value r/L is at most 0.790.
  • easiness of swing of the iron golf club can further be improved.
  • equivalent pendulum length of the iron golf club with the upper end of the grip being an axis of rotation is at least 0.877 m and at most 0.890 m.
  • the equivalent pendulum length is a value obtained by dividing the inertia moment by static moment. The inertia moment is given when the iron golf club is rotated with the grip upper end being the fulcrum.
  • the static moment is a value obtained by multiplying the mass of iron golf club by the distance from the grip upper end to the center of gravity of the iron golf club.
  • the inventors have found that the easiness of swing of the iron golf club can be improved when the equivalent pendulum length is at least 0.877 m and at most 0.890 m.
  • the iron golf club described above has club length L of at least 36.75 inches.
  • the length of iron club No. 7 is 36.75 inches.
  • the easiness of swing of an iron golf club tends to become a problem particularly in iron golf clubs of No. 7 and longer.
  • the club length set to be equal to or longer than 36.75 inches the easiness of swing of iron golf clubs of No. 7 and longer, of which easiness of swing tends to be a problem, can be improved.
  • easiness of swing can effectively be improved.
  • mass of the weight is at least 20g and at most 40g. Therefore, the easiness of swing of the iron golf club can be improved by optimizing the center-of-gravity-ratio r/L. Further, since the range of weight of the weight can be selected, degree of freedom in design can be improved.
  • the iron golf club in accordance with the present invention attains improved easiness of swing.
  • an iron golf club 1 in accordance with an embodiment of the present invention is formed to have the length L, which is measured in accordance with the 60-degrees method, of at least 36.5 inches.
  • 36.5 inches is about 0.927 meters (m).
  • the club length L may be 36.75 inches or longer.
  • 36.75 inches is about 0.933 meters (m).
  • Iron golf club 1 mainly includes a grip 2, a carbon shaft 3, a head 4 and a weight 5.
  • Grip 2 is attached to one end of carbon shaft 3, and head 4 is attached to the other end of carbon shaft 3.
  • Head 4 has a hitting face 4a.
  • Weight 5 is attached to carbon shaft 3.
  • Weight 5 is fixed on an inner circumferential surface, in the inner space of carbon shaft 3.
  • Weight 5 may be fixed on an outer circumferential surface of carbon shaft 3.
  • the mass of grip 2, carbon shaft 3, head 4 and weight 5 is set such that the sum will be at least 0.3996 kg and at most 0.4197 kg.
  • the value r/L of center-of-gravity-ratio obtained by dividing the distance r from the upper end 2a of grip 2 to the center of gravity G of iron golf club 1 by the length L of iron golf club is set to be at least 0.765 and at most 0.795.
  • the value r/L of center-of-gravity-ratio is at most 0.790.
  • the position of an axis of rotation RA as the center of rotation of iron golf club 1 is set to be the upper end 2a of grip 2.
  • the upper end 2a of grip 2 substantially corresponds to the rear end of carbon shaft 3.
  • the equivalent pendulum length Lp (m) with the upper end 2a of grip 2 being the axis of rotation RA is a value obtained by dividing inertia moment I (kg ⁇ m 2 ) around the upper end 2a of grip 2 by the mass m (kg) of iron golf club 1 and by the distance r (m) from the upper end 2a of grip 2 to the center of gravity G of iron golf club 1, and it is given by Equation (1) below.
  • Lp I / mr
  • the equivalent pendulum length Lp with the upper end 2a of grip 2 being the axis of rotation RA is set to be at least 0.877 m and at most 0.890 m.
  • the mass of weight 5 may be at least 20g and at most 40g.
  • Weight 5 may be formed of tungsten-containing prepreg.
  • the distance r from the upper end 2a of grip 2 to the center of gravity G of iron golf club 1 can be adjusted by weight 5.
  • Weight 5 is arranged on the side of grip 2.
  • weight 5 is arranged on the side of grip 2, as described above.
  • weight 5 may be arranged in a range from at least 0.295 m to at most 0.400 m from the upper end 2a of grip 2. In this case also, the distance r from the upper end 2a of grip 2 to the center of gravity G of iron golf club 1 can be made shorter.
  • easiness of swing of iron golf club 1 can be improved by optimizing the mass m and center-of-gravity-ratio r/L of iron golf club 1 having carbon shaft 3 and weight 5, with the club length L of at least 36.5 inches. Specifically, the easiness of swing of iron golf club 1 can be improved if the mass m of iron golf club 1 is at least 0.3996 kg and at most 0.4197 kg and the value of center-of-gravity-ratio r/L is at least 0.765 and at most 0.795.
  • the value of center-of-gravity-ratio r/L is at most 0.790. With this value, the easiness of swing of iron golf club 1 can further be improved.
  • the value Lp of the equivalent pendulum length with the upper end 2a of grip 2 being the axis of rotation RA is at least 0.877 m and at most 0.890 m.
  • the equivalent pendulum length Lp is the value obtained by dividing inertia moment I by the static moment. Inertia moment I is given by rotating iron golf club 1 with the upper end 2a of grip 2 used as a fulcrum. Static moment is a value obtained by multiplying the mass m of iron golf club 1 by the distance from the upper end 2 of grip 2 to the center of gravity G of iron golf club 1.
  • the club length L is at least 36.75 inches.
  • the length of iron club No. 7 is 36.75 inches.
  • the easiness of swing of an iron golf club tends to become a problem particularly in iron golf clubs 1 of No. 7 and longer.
  • the club length set to be equal to or longer than 36.75 inches the easiness of swing of iron golf clubs of No. 7 and longer, of which easiness of swing tends to be a problem, can be improved.
  • easiness of swing can effectively be improved.
  • the mass of weight 5 is at least 20g and at most 40g.
  • the mass of weight 5 is at least 20g and at most 40g.
  • Iron golf clubs of Comparative Examples 1 to 5 and Examples 1 to 3 having such specifications as shown in Table 1 were fabricated.
  • the reference characters shown in Fig. 1 correspond to the reference characters used in Table 1.
  • Iron golf clubs of Examples 1 to 3 and Comparative Example 5 have weights. Iron golf clubs of Comparative Examples 1 to 4 do not have weights. Iron golf clubs of Examples 1 to 3 and Comparative Examples 1, 2 and 4 have carbon shafts. Iron golf clubs of Comparative Examples 3 and 5 have steel shafts.
  • Example 1 m (kg) w (Kg) wl (m) L (inch) L (m) r/L r (m) mr (kg ⁇ m) Ig (kg ⁇ m 2 ) I (kg ⁇ m 2 ) I/mr (m) Ave Sensory best Carbon best Comparative Example 1 0.3684 - - 37.94 0.964 0.801 0.772 0.284 0.0441 0.2636 0.927 -0.015 1 2 Comparative Example 2 0.3797 - - 36.75 0.933 0.814 0.760 0.289 0.0410 0.2603 0.902 0.112 2 4
  • Example 1 0.3996 20 0.295 36.75 0.933 0.790 0.737 0.295 0.0452 0.2622 0.890 0.511 4 6
  • Example 2 0.3996 20 0.400 36.75 0.933 0.795 0.742 0.297 0.0436 0.2636 0.889 -0.220 2 4
  • Example 3 0.4197 40 0.295 36.75 0.933 0.765
  • m(kg) represents mass of iron golf club
  • w(kg) represents mass of weight
  • wl represents distance from the upper end of grip to the weight
  • L represents length of the club
  • L (in) is the length in inches
  • L(m) is the length in meters
  • r/L represents the center-of-gravity-ratio
  • r represents the distance from the upper end of grip to the center of gravity of the golf club
  • mr (kg ⁇ m) represents static moment
  • Ig (kg ⁇ m 2 ) represents inertia moment around the position of center of gravity
  • I (kg ⁇ m 2 ) represents inertia moment around the upper end of grip
  • I/mr (m) represents the equivalent pendulum length
  • Ave is an average value of factor scores for Factor 1, as the comprehensive evaluation of the easiness of swing.
  • the sensory best represents the number of subjects who put the highest value of factor score for Factor 1, for each club. Referring to Table 1, the number of subjects who put the highest value of factor score for Example 1 was 4.
  • the carbon best represents the number of subjects who put the highest value of factor score related to the easiness of swing of each club having the carbon shaft, excluding the clubs having the steel shaft. Referring to Table 1, when Comparative Example 4 having the steel shaft was excluded, the number of subjects who put the highest value for the factor score for Example 1 was 6.
  • SD method is for rating an object using a pair of bipolar criteria consisting of opposite adjectives modifying connotative meaning of concepts.
  • a plurality of subjects are asked to determine where his or her position lies on, for example, a scale of 7 levels, between each of the adjectives.
  • Table 2 The results of factor analysis executed using the results of evaluation by the subjects above are as shown in Table 2.
  • Table 2 the adjectives mentioned above are described as variables.
  • Table 2 Variable name Factor 1 Factor 2 Favorable Variable 1 0.936 0.032 Light Variable 2 0.007 0.992 Easy to swing Variable 3 0.942 0.058 Easy to time Variable 4 0.939 -0.074 Head advanced Variable 5 0.691 0.184 Feel good Variable 6 0.947 0.031 Contribution ratio 0.670 0.171
  • Factor 1 of variable "light” has a small value of factor loading, and Factor 2 has a large value of factor loading. Therefore, the inventors have found that the variable "light” does not correspond to the component of "easiness of swing.” Further, contribution ratio of Factor 1 is 0.670 and that of Factor 2 is 0.171 and, cumulative contribution ratio of Factors 1 and 2 is about 84.1%. Accordingly, the impression of actual hitting test of iron golf clubs of the present embodiment can be sufficiently explained by Factors 1 and 2.
  • the value Ave was large. From these results, the inventors have found that the easiness of swing can be improved if the mass m (Kg) of iron golf club having a carbon shaft is at least 0.3996 kg and at most 0.4197 kg and the value r/L of center-of-gravity-ratio is at least 0.765 and at most 0.795.
  • the value Ave of Example 2 was particularly high. Therefore, it is found that when the value of r/L center-of-gravity-ratio is at most 0.790, the easiness of swing of an iron golf club can further be improved.
  • Comparative Example 4 had a steel shaft.
  • a golf club having a steel shaft is generally said to be easier to swing than one having a carbon shaft.
  • the value Ave of Example 2 was even higher than Comparative Example 4. Namely, it was found that Example 2 of carbon shaft exhibited improved easiness of swing than the steel shaft.
  • the equivalent pendulum length (I/mr) was at least 0.877 m and at most 0.890 m. From these results, the inventors have found that the easiness of swing can be improved if the equivalent pendulum length is at least 0.877 m and at most 0.890 m.
  • the steel shaft is evaluated to be easier to swing, and this tendency can be seen from Table 1.
  • the carbon shaft has higher damping ratio and eases impact at the time of hitting and, therefore, it has an advantage of preventing fatigue.
  • Example 3 and Comparative Example 5 were evaluated by subjects, in the similar manner as described above.
  • the subjects were 15 golfers with superior analytical ability.
  • Tables 3 and 4 show the results of factor analysis on the evaluations by the subjects mentioned above.
  • the adjectives are described as variables.
  • Table 3 Factor score Factor 1 Factor 2 Example 3 0.120 0.263 Comparative Example 5 -0.120 -0.263
  • Table 4 Factor loading: after loading (varimax) Variable name Factor 1 Factor 2 Favorable 0.958 -0.083 Light -0.069 0.473 Easy to swing 0.952 0.203 Easy to time 0.953 0.009 Head advanced 0.512 0.538 Feel good 0.942 0.018
  • Example 3 had higher factor score than Comparative Example 5. From this result, the inventors have found that Example 3 can improve the easiness of swing, as compared with Comparative Example 5.
  • Varimax method of Table 4 is a method involving orthogonal rotation to facilitate factor interpretation, in which the factor is rotated to maximize "varimax criteria" defined as the sum of variances of the squared factor loadings modified by communality.

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  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Physical Education & Sports Medicine (AREA)
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EP12193478.0A 2011-11-22 2012-11-20 Iron golf club Withdrawn EP2596837A1 (en)

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JP2011255095A JP5420626B2 (ja) 2011-11-22 2011-11-22 アイアンゴルフクラブ

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150024865A1 (en) * 2013-07-22 2015-01-22 Dunlop Sports Co. Ltd. Golf club
US20150031467A1 (en) * 2013-07-23 2015-01-29 Dunlop Sports Co. Ltd. Golf club
US20150087435A1 (en) * 2013-09-20 2015-03-26 Dunlop Sports Co. Ltd. Golf club
US9327169B2 (en) * 2013-09-20 2016-05-03 Dunlop Sports Co. Ltd. Golf club
JPWO2015105021A1 (ja) * 2014-01-08 2017-03-23 三菱レイヨン株式会社 ゴルフクラブ用シャフト及びゴルフクラブ

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5826905B1 (ja) * 2014-09-10 2015-12-02 ダンロップスポーツ株式会社 ゴルフクラブ
JP5886392B1 (ja) * 2014-09-10 2016-03-16 ダンロップスポーツ株式会社 ゴルフクラブ
US9522313B2 (en) * 2014-12-22 2016-12-20 Taylor Made Golf Company, Inc. Counterbalanced putters
CN113195063B (zh) * 2018-12-17 2022-07-19 藤仓复合材料科技株式会社 高尔夫球杆杆身以及高尔夫球杆
JP6658946B1 (ja) * 2019-04-26 2020-03-04 住友ゴム工業株式会社 ゴルフクラブ

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US5297791A (en) * 1990-06-04 1994-03-29 Fujikura Rubber Ltd. Golf club shaft and method of producing the same
US5569097A (en) * 1991-10-17 1996-10-29 Taylor Made Golf Company, Inc. Balanced golf club
JPH10155952A (ja) * 1996-11-29 1998-06-16 Daiwa Seiko Inc ゴルフクラブシャフト
JP2001286582A (ja) 2000-04-06 2001-10-16 Yokohama Rubber Co Ltd:The ゴルフクラブセット
US20020107089A1 (en) * 1999-10-27 2002-08-08 Megumi Yamada Golf club shaft formed from metal-containing prepreg and non-metal fiber prepreg and method of making the same
US20070117647A1 (en) * 2005-11-21 2007-05-24 Bridgestone Sports Co., Ltd. Golf club shaft
US20100041492A1 (en) * 2008-08-12 2010-02-18 Rice Scott A Golf club shaft with high balance point and golf club including same
JP2011255095A (ja) 2010-06-11 2011-12-22 Olympus Medical Systems Corp 医療用補助具及び医療システム

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JP2672399B2 (ja) * 1991-10-17 1997-11-05 テイラー メイド ゴルフ カムパニー，インコーポレーテッド バランスのとれたゴルフクラブ
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JP2001087434A (ja) * 1999-09-24 2001-04-03 Atsuo Hirota ゴルフクラブのバランシング法
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5297791A (en) * 1990-06-04 1994-03-29 Fujikura Rubber Ltd. Golf club shaft and method of producing the same
US5569097A (en) * 1991-10-17 1996-10-29 Taylor Made Golf Company, Inc. Balanced golf club
JPH10155952A (ja) * 1996-11-29 1998-06-16 Daiwa Seiko Inc ゴルフクラブシャフト
US20020107089A1 (en) * 1999-10-27 2002-08-08 Megumi Yamada Golf club shaft formed from metal-containing prepreg and non-metal fiber prepreg and method of making the same
JP2001286582A (ja) 2000-04-06 2001-10-16 Yokohama Rubber Co Ltd:The ゴルフクラブセット
US20070117647A1 (en) * 2005-11-21 2007-05-24 Bridgestone Sports Co., Ltd. Golf club shaft
US20100041492A1 (en) * 2008-08-12 2010-02-18 Rice Scott A Golf club shaft with high balance point and golf club including same
JP2011255095A (ja) 2010-06-11 2011-12-22 Olympus Medical Systems Corp 医療用補助具及び医療システム

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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150024865A1 (en) * 2013-07-22 2015-01-22 Dunlop Sports Co. Ltd. Golf club
US9211459B2 (en) * 2013-07-22 2015-12-15 Dunlop Sports Co. Ltd. Golf club
US20150031467A1 (en) * 2013-07-23 2015-01-29 Dunlop Sports Co. Ltd. Golf club
US9220952B2 (en) * 2013-07-23 2015-12-29 Dunlop Sports Co. Ltd. Golf club
US9901790B2 (en) 2013-07-23 2018-02-27 Dunlop Sports Co. Ltd. Golf club
US10307647B2 (en) 2013-07-23 2019-06-04 Sumitomo Rubber Industries, Ltd. Golf club
US20150087435A1 (en) * 2013-09-20 2015-03-26 Dunlop Sports Co. Ltd. Golf club
US9327169B2 (en) * 2013-09-20 2016-05-03 Dunlop Sports Co. Ltd. Golf club
US9403065B2 (en) * 2013-09-20 2016-08-02 Dunlop Sports Co. Ltd. Golf club
US10016663B2 (en) 2013-09-20 2018-07-10 Sumitomo Rubber Industries, Ltd. Golf club
JPWO2015105021A1 (ja) * 2014-01-08 2017-03-23 三菱レイヨン株式会社 ゴルフクラブ用シャフト及びゴルフクラブ

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JP5420626B2 (ja) 2014-02-19
US8715101B2 (en) 2014-05-06
US20130130824A1 (en) 2013-05-23
JP2013106839A (ja) 2013-06-06

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